初始位相对超短脉冲强激光场高次谐波辐射的影响

PHASE DEPENDENCE OF HIGH ORDER HARMONIC SPECTRA WITH ULTRASHORT LASER PULSES

通过求解含时Ｓｃｈｒｄｉｎｇｅｒ方程，用加窗Ｆｏｕｒｉｅｒ分析的方法，从理论上分析了入射激光场的初始位相对超短强激光场高位谐波辐射的影响．发现相对于较长的入射激光脉冲其激光场初始位相对超短脉冲高次谐波辐射的影响非常显著。

Abstract High order harmonic spectra are obtained by numerically solving the one dimension time dependent Schrdinger equation with single active electron approximation.The influence of the initial phase of the excitation field on the single atom high harmonic generation is analysized through Gabor analysis of the acceleration of the atomic dipole.The influence of the initial phase on the process of the high harmonic generation stronger for the shorter duration pulses than for the longer case.A pulse train or a single pulse of subfemtosecond level could be obtained by high harmonic generation through the adjustment of the phase of the excitation laser field.